Dipper tooth



. ly 1931- Q o. w. ANDERSEN 1,815,320

DIPPER TOOTH Filed Nov. 30. 1928 2 Sheets-Sheet l 1&1. 2. v Z6 July 21,1931. o. w. ANDERSEN DIPPER TOOTH Filed NOV. 30, 1928 2 Sheets-Sheet 2Patent ed July 21, 1931 mun-:1) STATES PATENT OFFICE OSCAR ANDERSEN, 01'OAK PARK, ILLINOIS, ASSIGNOR TO PETTIBO'NE MULLIKEN COMPAN'I'OI'CHICAGO, ILLINOIS, A CORPORATION OF NEW YORK DIPPEB TOOTH Applicationfiled November 30, 1928. Serial No. 322,776.

My invention relates to teeth for dippers such as are usedfor'excavating, dredging,

I {such teeth in place on the dipper, the invention relating moreespecially to constructions of the type in which the tooth properextends at a part thereof into a recess in the base for the tooth anddisposed crosswise of the cutting edge of the tooth, and portions of thebase, more particularly at its outer terminal portion, extend intorecessed portions of the tooth proper to aid in resisting lateralpressure directed against the tooth, the vtooth proper being secured tothe base as by a pin.

My primary object is to provide a construction of the general type abovereferred to in which the securing means, such as a pin, shall berendered highly effective to resist the shearing stresses to which suchmeans are subjected 1n digging, and furthermore be readily accessiblefor removal, when desired, without obstruction from adjacent teeth.

Referring to the accompanying drawings Figure 1 is a view in elevationof a portion of excavating apparatus comprising a dipper embodying myinvention, the dipper being shown as associated with a bank of materialagainst which it is operating.

Figure 2 is an enlarged side view of one of the dipper-tooth bases, witha dipper tooth thereon, with which the dipper of Fig. 1 is provided.

Figure 3 is an edge view 'of the structure shown in Fig. 2.

-Figure 4 is an enlarged view of the upper end portion of the structureshown in Fig. 3 with certain parts sectioned.

Figure 5 is a perspective view of the outer end of the dipper-tooth baseof the preceding figures.

Figure 6 is a perspective view of the dipper-tooth proper of thepreceding figures.

Figure 7 is a perspective view of the terminal portion of a dipper-toothbase of modified construction.

Figure 8 is a perspective view of the tooth for cooperation with thebase of Fig. 7; and

Figure 9, a view in side elevation of the assembled base and tooth ofFigs. 7 and 8.

In Fig. 1 I have illustrated the relation borne by the dipper,represented at 10, to a bank, represented at 11, from which the materialis to. be removed, the dipper being carried by a boom 12 and connectedwith lifting means 13 in accordance with common practice, such that theteeth, (one only of which is shown at 14) carried by the front section15 of the dipper, are subjected in digging, to forces tending to tiltthem on their support to the left in Fig. 1 which exerts shearingstresses at the connection between the tooth and its support, and it istherefore necessary to provide securing means for the teeth so disposedas to adequately resist these shearing stresses.

Referring to the construction shown in Figs. 1- to 6, inclusive, theteeth 14 are mounted, respectively, on bases one only of which is shownat 16, these bases being formed separate from the front section 15' ofthe dipper and overlapping the lip 17 thereof in which position they aresecured, as by fastening devices passing through the openings 18 in thebases and the lip portion of the dipper, the bases shown being of commonform except as to their upper seat-forming portions iamdl prra-nged inspaced relation along the The upper terminal portion of the base 16 issymmetrically tapered from opposite sides thereof as represented at 19and 20 this portion of the base, which is slightly angularly disposed tothe body of the base as shown, containing a recess 21 opening throughthe terminal end of the base with the extremities of its side wallsrecessed as represented at 22 to provide the tongues represented at 23,one side wall of the recess 21 containing a tapering groove representedat 24, this groove preferably inclining downwardly toward the front sideof the tooth base as sented at 26, its lower edge portion being thearrangement of the parts being being extended upwardly to form undercutrecess-extensions 31 into which the tongues 23 extend.

In accordance with the particular construction shown, the undercutrecesses 31 are provided by recessing the tooth across the upper end ofthe web 30 and to points beyond the lateral faces of the latter.

The web of the tooth 14 contains in its opposite sides tapering groovesrepresented at 32 and 33, which are disposed preferably at right anglesto the longitudinal axis of the.

tooth, these grooves opening into alining tapering openings 34: and 35,respectively, which open through opposite faces of the tooth as shown,one of said openings tapering toward one face of the tooth and the otherthereof toward the opposite face thereof. The grooves 32 and openings 34and 35 provided to receive a securing pin hereinafter referred to, areso disposed that when the tooth is seated on the base in one positionone of the grooves 32 and 33 will extend parallel with, and directlyoppose, the groove 24 and when applied to the base in reversed positionthe other of the grooves 32 and 33 will extend parallel with, anddirectly oppose, the groove 24. In either positionof the tooth thegroove 24 and the one of the grooves 32 and 33 opposing it will form atapered opening of circular shape in cross section at this part of thestructure to receive the tapered securing pin representedat 36 which isinserted into the larger end of this tapered opening in the tooth anddriven to the position shown in Fig. 2.

The pin 36 is thus caused to extend in such a position that the shearingstresses against the pin in digging are exerted laterally against thepin alon planes coincident with the longitudinal axls of the pin asdistinguished from exerting these stresses against a comparatively smalltransverse area thereof whereby a pin of a given cross section whichwould be too small to resist the shearing stresses if the latter wereexerted against them in a crosswise direction but which adequatelyresists the shearing stresses when exerted against it in accordance withmy invention, may be used.

The stresses exerted laterally against the tooth are resisted primarilyby the lapped portions of the web 30 and the nose portion 19 and thetongues 23 and the end walls of the recesses 31 lapped thereby.

The disposition of the pin 36 as shown is also of advantage as it isthereby rendered readily accessible for removal, when desired withoutobstruction from adjacent ones of the teeth.

The tooth 14 preferably, and as shown, is reversible on the base and ineither of its two positions the securing pin is so disposed as to resistthe shearing stresses in digging as above explained, the feature ofreversely tapering the grooves in the tooth permitting of the driving ofthe pin to securing position in either of the two positions of thetooth.

The construction shown in Figs. 7, 8 and 9 is the same as that of thepreceding figures except for slightvariations in proportions of theparts and the relationship of the Web on the tooth to the nose portionand the location of the securing pin. In this construc tion the web ofthe tooth, corresponding beyond the body of the tooth and into a recess38 in the base 29 to the position shown in Fig. 9.

The Web 37 adjacent its outer extremity contains at opposite sidesgrooves represented at 39 and tapered in opposite directions,respectively, as explained of the grooves in the tooth 14 of Fig. 5.This grooved portion of the web extends into the recess 38 in the base29, which latter contains a tapered opening 40 extending therethroughfor receiving the tapered tooth-securing pin, such as in the pin 36, theopening 40 being so disposed that it is in the form of a tapering grooveof semicircular shape in cross section where it traverses the wall ofthe recess 38 so that the pin driven into the hole 40 extends partlyinto the groove in this recess and the opposing groove 39 in the web 37.

The securing pin in this construction is thus so positioned thatshearing stresses exerted against it in digging are resisted asexplained of the pin of the construction of the preceding figures.

In both of the constructions shown the pin may be driven to positionfrom the upper side of the tooth structure considering the dipper aslaid down onits face or front portion. However, if desired, the tooth ofigs. 4 and-5 may contain only one pin-receiving groove communicatingwith terminal openings and the front portion of the I dipper twooppositely tapering pin-receiving tions and those shown variouslymodified and altered without departing from the spirit of my invention.

What I claim as new, and desire to secure by Letters Patent, is:

A dipper having a front portion containing a groove open at its oppositeends and having laterally spaced tongues at opposite sides of saidgroove, a tooth on said front portion having a web which extends intosaid groove, a surface of said web and an opposing surface of one ofsaid tongues having registering grooves extending crosswise of saidtooth and located substantially midway between the ends of saidlast-referred-to tongues and a pin extending lengthwise in said re'stering grooves.

SCAR W. ANDERSEN.

